// lockable.hpp v2.1
/*
 *  Copyright (c) 2007 Leigh Johnston.
 *
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 *     * Neither the name of Leigh Johnston nor the names of any
 *       other contributors to this software may be used to endorse or
 *       promote products derived from this software without specific prior
 *       written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 *  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 *  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#pragma once

#include "neolib.hpp"
#include <mutex>
#include "noncopyable.hpp"

#ifdef _WIN32
#include <intrin.h>
#pragma intrinsic(_ReadBarrier)
#pragma intrinsic(_WriteBarrier)
#pragma intrinsic(_ReadWriteBarrier)
#define MEMORY_BARRIER_ACQUIRE _ReadBarrier();
#define MEMORY_BARRIER_ACQUIRE_DEPENDANT _ReadBarrier();
#define MEMORY_BARRIER_RELEASE _WriteBarrier();
#define MEMORY_BARRIER _ReadWriteBarrier();
#else
#define MEMORY_BARRIER_ACQUIRE
#define MEMORY_BARRIER_ACQUIRE_DEPENDANT
#define MEMORY_BARRIER_RELEASE
#define MEMORY_BARRIER
#endif

namespace neolib
{
    class lockable
    {
        // construction
    public:
        lockable() {}
        lockable(const lockable&) {}
        virtual ~lockable() {}
        lockable& operator=(const lockable&) { return *this; }
        // operations
    public:
        void lock() const { iMutex.lock(); }
        void unlock() const { iMutex.unlock(); }
        // attributes
    private:
        mutable std::recursive_mutex iMutex;
    };

    class lock : noncopyable
    {
        // construction
    public:
        lock(const lockable& aLockable) : iLockable(aLockable) { iLockable.lock(); }
        ~lock() { iLockable.unlock(); }
        // attributes
    private:
        const lockable& iLockable;
    };

    inline void memory_barrier_acquire()
    {
        MEMORY_BARRIER_ACQUIRE
    }

    inline void memory_barrier_acquire_dependant()
    {
        MEMORY_BARRIER_ACQUIRE
    }

    inline void memory_barrier_release()
    {
        MEMORY_BARRIER_RELEASE
    }

    inline void memory_barrier()
    {
        MEMORY_BARRIER
    }
}
